Batter in fair ball territory

[dlsumpntx]

A left handed slap hitter runs forward as the pitch approaches. When she doesn't swing she ends up half way to the circle. We've all seen it. In this instance the batter stays where she ended up, takes her practice swings, and even gets her signal from the coach before getting back in the box. By what rule, if any, might we prevent her from hanging out in fair territory when the ball is live? (NFHS & USA please)

Also, there was a passed ball & the pitcher covered home. On her way back to the circle the pitcher was struck by the bat of the batter loitering between home plate & the circle. Some say, oops it's an accident, others say warning for being reckless with the bat. Thoughts?